A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Mentone, CA
Mentone homeowners call us when they need straight answers about adding space: what it costs, what the town will approve, and how long the work actually takes. We’re Fielding ADU Builders, the ADU and room-addition specialist inside the Garrison Partners family. We price every Mentone job in writing before any work starts, and we stand behind the finished build with a one-year written guarantee. Call (361) 315-4177 for a free estimate on a garage conversion, backyard ADU, or room addition in Mentone.
Why Mentone Homes Are Different
Mentone sits in the eastern stretch of the Inland Empire between Redlands and Yucaipa, where lots run larger than what you’ll find closer to San Bernardino, and that changes the ADU conversation. A detached backyard unit fits on more Mentone parcels than in denser cities to the west, and setback requirements are often easier to meet without a variance. Homes here range from aging ranch-style houses on half-acre lots to newer builds in the foothill tracts, and the older stock carries the usual concerns: dated electrical panels, undersized foundations, and roof lines that need attention before any addition ties in.
Climate matters too. Mentone summers push past 100 degrees, so insulation, window placement, and HVAC sizing are not afterthoughts, they’re the difference between an ADU that rents easily and one that sits empty in August. The terrain rises toward the San Bernardino foothills on the north side of town, and some lots have grade changes that require additional foundation or retaining work. Homeowners here tend to know their neighbors and keep their properties squared away, which is exactly the kind of Mentone customer we work well with.
Our Main Mentone Services
Most Mentone homeowners who call us are weighing two or three options for adding space, and the right choice depends on lot size, budget, and how the space will be used. These are the services we handle in Mentone, each with its own dedicated page.
Room Addition Contractor in Mentone
A room addition in Mentone often means extending an older ranch home or adding a primary suite to a foothill property. We frame, roof, and finish the addition to match the existing structure, which matters more on Mentone’s older homes than people expect. Permitting runs through San Bernardino County, and we handle the plans and inspections. Room Addition Contractor in Mentone covers the full scope, from foundation to final paint.
Garage Conversion Contractor in Mentone
Many Mentone homes have attached garages that sit half-empty, and converting one is usually the fastest path to a rentable studio or in-law space. The job involves insulating, drywalling, running electrical and plumbing where needed, and replacing the garage door with a proper wall and window. Garage Conversion Contractor in Mentone explains what the county looks for and what a conversion typically costs here.
ADU Builders in Mentone
A detached backyard ADU gives Mentone homeowners a separate rental unit or guest house without touching the main structure. We work with prefab and modular platforms like Abodu, Cover, and Dvele, as well as conventional stick-built designs using James Hardie siding. ADU Builders in Mentone covers build methods, timelines, and what to budget for a detached unit on a Mentone lot.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Mentone
We work regularly with James Hardie siding, Abodu, Cover, and Dvele systems on Mentone projects. Parts and materials for these brands are stocked or ordered through our Inland Empire supply lines, which keeps lead times short. See our brands for the full list of platforms and materials we build with.
Pricing for ADU Company in Mentone, CA
These are the price ranges Mentone homeowners should expect before permit fees. Every project gets a written, line-item quote before work starts, and that number does not move.
| Service | Typical range in Mentone |
|---|---|
| Garage conversion (attached, basic to mid-range finish) | $45,000 – $85,000 |
| Garage conversion (high-end, full studio or one-bedroom) | $85,000 – $130,000 |
| Detached ADU (prefab or modular, 400 – 600 sq ft) | $110,000 – $180,000 |
| Detached ADU (stick-built, 600 – 800 sq ft) | $180,000 – $260,000 |
| Detached ADU (two-bedroom, 800 – 1,000 sq ft) | $260,000 – $350,000 |
| Room addition (single room, 150 – 250 sq ft) | $30,000 – $65,000 |
| Room addition (primary suite, 300 – 500 sq ft) | $65,000 – $120,000 |
| Room addition (multi-room extension, 500+ sq ft) | $120,000 – $200,000 |
Prices in Mentone move up when a lot has significant grade change, when an older home needs panel or foundation work before the addition ties in, or when the county requires a setback variance. That’s why we write the price down only after we’ve walked the site, not over the phone. You approve the number on paper, and that’s the number on the final invoice.
Neighborhoods We Serve in Mentone
Fielding ADU Builders works across Mentone, from the flatter central streets to the foothill lots on the north edge of town. We schedule estimates throughout Mentone with local crews, so a site visit usually happens within a few days of your call.
- Central Mentone, near Mentone Boulevard and Highway 38
- Foothill tracts north of Mentone, toward the San Bernardino National Forest boundary
- The residential streets east of Crafton Avenue
- Lots along the 92359 corridor, including the older ranch parcels
- West Mentone, bordering Redlands
Service Area – Cities Near Mentone
We serve Mentone and the surrounding Inland Empire communities, including Redlands, CA, Yucaipa, CA, Highland, CA, and Calimesa, CA. If you’re in Mentone or one of these nearby cities, the same written-price policy and one-year guarantee apply.
Serving Mentone, CA - Our Local Coverage Area
We’re based in the Mentone area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in Mentone
We typically schedule a site visit within a few days of your call, and once plans are approved, work begins on a timeline we spell out in writing. The county’s permit review is usually the longest variable, and we handle that process for you.
Some Mentone neighborhoods have HOAs with design-review rules, while many older streets do not. State law limits an HOA’s ability to block an ADU outright, but design standards and setbacks can still apply. We check this early so there are no surprises.
Yes. Every Mentone project gets a written price before any work starts, covering the full scope we agree on. If something changes mid-project, we put the change order in writing before proceeding, so you’re never surprised by the final invoice.
Ready to talk about adding space in Mentone? Call (361) 315-4177 for a free estimate. We’ll walk the lot, answer your questions, and put the price in writing before you commit to anything.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Mentone Customers Say
"Insulation, drywall, and finishes were all well done. Feels like part of the house."
- Pete O."Built a detached ADU behind our house. The builder is a veteran and runs the site like a platoon: schedule posted, crew on time, everything labeled. Finished within a few days of the date."
- Ken W."Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L.
